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Status of Sample Combustion and Graphitization Lines at INFN-LABEC, Florence

Published online by Cambridge University Press:  09 February 2016

M E Fedi*
Affiliation:
INFN Sezione di Firenze, via Sansone 1, 50019 Sesto Fiorentino (Fi), Italy
V Bernardoni
Affiliation:
Dipartimento di Fisica, Università degli Studi di Milano, e INFN Sezione di Milano, via Celoria 16, 20133 Milan, Italy
L Caforio
Affiliation:
INFN Sezione di Firenze, via Sansone 1, 50019 Sesto Fiorentino (Fi), Italy Dipartimento di Fisica e Astronomia, Università degli Studi di Firenze, via Sansone 1, 50019 Sesto Fiorentino (Fi), Italy
G Calzolai
Affiliation:
INFN Sezione di Firenze, via Sansone 1, 50019 Sesto Fiorentino (Fi), Italy Dipartimento di Fisica e Astronomia, Università degli Studi di Firenze, via Sansone 1, 50019 Sesto Fiorentino (Fi), Italy
L Carraresi
Affiliation:
INFN Sezione di Firenze, via Sansone 1, 50019 Sesto Fiorentino (Fi), Italy Dipartimento di Fisica e Astronomia, Università degli Studi di Firenze, via Sansone 1, 50019 Sesto Fiorentino (Fi), Italy
M Manetti
Affiliation:
INFN Sezione di Firenze, via Sansone 1, 50019 Sesto Fiorentino (Fi), Italy
F Taccetti
Affiliation:
INFN Sezione di Firenze, via Sansone 1, 50019 Sesto Fiorentino (Fi), Italy
P A Mandò
Affiliation:
INFN Sezione di Firenze, via Sansone 1, 50019 Sesto Fiorentino (Fi), Italy Dipartimento di Fisica e Astronomia, Università degli Studi di Firenze, via Sansone 1, 50019 Sesto Fiorentino (Fi), Italy
*
2Corresponding author: Email: fedi@fi.infn.it.

Abstract

Since installation of the new accelerator at INFN-LABEC in Florence in 2004, the workload has progressively increased in the radiocarbon dating laboratory, requiring a faster sample preparation throughput and greater versatility to allow for a larger variety of treated materials. The “standard” sample preparation line is based on an elemental analyzer (EA) for the combustion of the pretreated samples, and a vacuum line where the CO2 is collected and then converted to graphite. This line has been recently redesigned while maintaining the EA, since this instrument provides us reliable and fast sample combustion and separation of gases. The volumes were optimized and all the mechanical parts (e.g. the fittings) were changed in order to improve the vacuum level, thus decreasing the possibility of contamination; finally, the number of graphitization reactors was doubled (from 4 to 8). In those rare cases involving samples characterized by a complex nearly graphitic structure (e.g. burnt residues), the EA might not guarantee a complete combustion. For these samples, we successfully tested the new sample preparation line that has been recently installed at LABEC and especially dedicated to aerosol samples. This line is equipped with a custom-made combustion oven able to heat to 1000 °C. The subsequent gas separation is accomplished by chemical and thermal traps. As an example, the dating of organic matter collected from an Etruscan bronze statue will be presented and discussed.

Type
Articles
Copyright
Copyright © 2013 by the Arizona Board of Regents on behalf of the University of Arizona 

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